BUG: A2154 If Structure Member in Control-Flow Directive (74666)
The information in this article applies to:
- Microsoft Macro Assembler (MASM) 6.0
- Microsoft Macro Assembler (MASM) 6.0a
- Microsoft Macro Assembler (MASM) 6.0b
- Microsoft Macro Assembler (MASM) 6.1
- Microsoft Macro Assembler (MASM) 6.11
This article was previously published under Q74666 SYMPTOMS
The Microsoft Macro Assembler (MASM) versions 6.0 and later provide
several Control-Flow directives such as the .WHILE, .REPEAT, and .IF
constructs. When structure members are accessed inside of these
constructs, MASM may incorrectly generate the following error:
error A2154: syntax error on control-flow directive
RESOLUTION
The sample program below illustrates this problem. As a workaround, a
register or a temporary variable may be used to hold the structure
member, as demonstrated below in Sample Code 2.
STATUS
Microsoft has confirmed this to be a problem in MASM versions 6.0,
6.0a, 6.0b, 6.1, 6.1a, and 6.11. We are researching this problem and
will post new information here in the Microsoft Knowledge Base as it
becomes available.
Sample Code 1
; Assemble options needed: none
.MODEL small, C
STRUCT1 STRUCT
SMember SWORD 0
STRUCT1 ENDS
.STACK 4096
.DATA
var1 STRUCT1 <0>
.CODE
.startup
mov bx, OFFSET var1
.WHILE ((STRUCT1 PTR [bx]).SMember != 1000)
inc (STRUCT1 PTR [bx]).SMember
.ENDW
.REPEAT
dec (STRUCT1 PTR [bx]).SMember
.UNTIL ((STRUCT1 PTR [bx]).SMember == 0)
.IF ((STRUCT1 PTR [bx]).SMember == 0)
nop
.ENDIF
.exit 0
END
Sample Code 2
; Assemble options needed: none
.MODEL small, C
STRUCT1 STRUCT
SMember SWORD 0
STRUCT1 ENDS
.STACK 4096
.DATA
var1 STRUCT1 <0>
.CODE
.statup
mov bx, OFFSET var1.SMember
.WHILE (SWORD PTR [bx] != 1000)
inc SWORD PTR [bx]
.ENDW
.REPEAT
dec SWORD PTR [bx]
.UNTIL (SWORD PTR [bx] == 0)
.IF (SWORD PTR [bx] == 0)
nop
.ENDIF
.exit 0
END
| Modification Type: | Major | Last Reviewed: | 10/20/2003 |
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| Keywords: | KB74666 |
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